Abstract
Anisotropic diffusion has been known to be closely related to adaptive smoothing and discretized in a similar manner. This paper revisits a fundamental relationship between two approaches. It is shown that adaptive smoothing and anisotropic diffusion have different theoretical backgrounds by exploring their characteristics with the perspective of normalization, evolution step size, and energy flow. Based on this principle, adaptive smoothing is derived from a second order partial differential equation (PDE), not a conventional anisotropic diffusion, via the coupling of Fick's law with a generalized continuity equation where a 'source' or 'sink' exists, which has not been extensively exploited. We show that the source or sink is closely related to the asymmetry of energy flow as well as the normalization term of adaptive smoothing. It enables us to analyze behaviors of adaptive smoothing, such as the maximum principle and stability with a perspective of a PDE. Ultimately, this relationship provides new insights into application-specific filtering algorithm design. By modeling the source or sink in the PDE, we introduce two specific diffusion filters, the robust anisotropic diffusion and the robust coherence enhancing diffusion, as novel instantiations which are more robust against the outliers than the conventional filters.
| Original language | English |
|---|---|
| Article number | 6341839 |
| Pages (from-to) | 1096-1107 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Image Processing |
| Volume | 22 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2013 Feb 11 |
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All Science Journal Classification (ASJC) codes
- Software
- Computer Graphics and Computer-Aided Design
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Revisiting the relationship between adaptive smoothing and anisotropic diffusion with modified filters. / Ham, Bumsub; Min, Dongbo; Sohn, Kwanghoon.
In: IEEE Transactions on Image Processing, Vol. 22, No. 3, 6341839, 11.02.2013, p. 1096-1107.Research output: Contribution to journal › Article
TY - JOUR
T1 - Revisiting the relationship between adaptive smoothing and anisotropic diffusion with modified filters
AU - Ham, Bumsub
AU - Min, Dongbo
AU - Sohn, Kwanghoon
PY - 2013/2/11
Y1 - 2013/2/11
N2 - Anisotropic diffusion has been known to be closely related to adaptive smoothing and discretized in a similar manner. This paper revisits a fundamental relationship between two approaches. It is shown that adaptive smoothing and anisotropic diffusion have different theoretical backgrounds by exploring their characteristics with the perspective of normalization, evolution step size, and energy flow. Based on this principle, adaptive smoothing is derived from a second order partial differential equation (PDE), not a conventional anisotropic diffusion, via the coupling of Fick's law with a generalized continuity equation where a 'source' or 'sink' exists, which has not been extensively exploited. We show that the source or sink is closely related to the asymmetry of energy flow as well as the normalization term of adaptive smoothing. It enables us to analyze behaviors of adaptive smoothing, such as the maximum principle and stability with a perspective of a PDE. Ultimately, this relationship provides new insights into application-specific filtering algorithm design. By modeling the source or sink in the PDE, we introduce two specific diffusion filters, the robust anisotropic diffusion and the robust coherence enhancing diffusion, as novel instantiations which are more robust against the outliers than the conventional filters.
AB - Anisotropic diffusion has been known to be closely related to adaptive smoothing and discretized in a similar manner. This paper revisits a fundamental relationship between two approaches. It is shown that adaptive smoothing and anisotropic diffusion have different theoretical backgrounds by exploring their characteristics with the perspective of normalization, evolution step size, and energy flow. Based on this principle, adaptive smoothing is derived from a second order partial differential equation (PDE), not a conventional anisotropic diffusion, via the coupling of Fick's law with a generalized continuity equation where a 'source' or 'sink' exists, which has not been extensively exploited. We show that the source or sink is closely related to the asymmetry of energy flow as well as the normalization term of adaptive smoothing. It enables us to analyze behaviors of adaptive smoothing, such as the maximum principle and stability with a perspective of a PDE. Ultimately, this relationship provides new insights into application-specific filtering algorithm design. By modeling the source or sink in the PDE, we introduce two specific diffusion filters, the robust anisotropic diffusion and the robust coherence enhancing diffusion, as novel instantiations which are more robust against the outliers than the conventional filters.
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U2 - 10.1109/TIP.2012.2226904
DO - 10.1109/TIP.2012.2226904
M3 - Article
VL - 22
SP - 1096
EP - 1107
JO - IEEE Transactions on Image Processing
JF - IEEE Transactions on Image Processing
SN - 1057-7149
IS - 3
M1 - 6341839
ER -